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$sizeUnit: rem
$marginKey: "m"
$paddingKey: "p"
$separator: "-"
$sizes: ("none", 0), ("auto", auto), ("xxs", 0.125), ("xs", 0.25), ("sm", 0.5), ("md", 1), ("lg", 2), ("xl", 4), ("xxl", 8)
$positions: ("t", "top"), ("r", "right"), ("b", "bottom"), ("l", "left")

@function sizeValue($key, $value)
  @return if($key == "none" or $key == "auto", $value, $value + $sizeUnit)